While you could use an Android device to capture iTunes Radio streams before, DoubleTwists latest AirPlay Recorder update brings that functionality to Cupertinos desktops. Based on the walk-through that the outfit lists on its blog, the Mac app seems pretty simple to implement too. First, select the app as an AirPlay device and then start playing a song or station. Thats it. While some might scoff at the price ($10), convenience doesnt always come free.